Convert Ounces per Square Foot to Grams per Square Metre
1 ounce per square foot (oz/ft²) = 305.1517273 grams per square metre (g/m²). 1 g/m² = 0.003277058298 oz/ft². Example: 15 oz/ft² = 15 × 305.1517273 = 4577.275909 g/m².
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1 oz/ft² = 305.1517273 g/m²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ounce per square foot to gram per square metre converter to paste a column from Excel.
How to Convert Ounce per Square Foot to Gram per Square Metre
- 1 oz/ft² = 305.1517273 g/m²
- 1 g/m² = 0.003277058298 oz/ft²
- Example: convert 15 oz/ft² to g/m²: 15 oz/ft² = 15 × 305.1517273 g/m² = 4577.275909 g/m²
Formula
g/m² = oz/ft² × 305.1517272739
Derivation from SI units:
- 1 oz/ft² = 28.349523125 g ÷ 0.09290304 m² = 305.1517192 g/m² (exact ratio)
- Mass in grams of one square metre of fabric (GSM); 1 g/m² = 0.001 kg/m².
Both units are defined exactly, so the factor is exact. Ounce per Square Foot definition: ounce per square foot; Gram per Square Metre definition: gram per square metre.
Worked examples
- A reading of 0.75 oz/ft² converts to 228.8637955 g/m².
0.75 oz/ft² × 305.1517273 = 228.8637955 g/m² - A value of 2 oz/ft² is 610.3034545 g/m².
2 oz/ft² × 305.1517273 = 610.3034545 g/m²
Ounce per Square Foot to Gram per Square Metre conversion table
| Ounces per Square Foot (oz/ft²) | Grams per Square Metre (g/m²) |
|---|---|
| 0.1 oz/ft² | 30.51517273 g/m² |
| 0.25 oz/ft² | 76.28793182 g/m² |
| 0.5 oz/ft² | 152.5758636 g/m² |
| 0.75 oz/ft² | 228.8637955 g/m² |
| 1 oz/ft² | 305.1517273 g/m² |
| 1.5 oz/ft² | 457.7275909 g/m² |
| 2 oz/ft² | 610.3034545 g/m² |
| 3 oz/ft² | 915.4551818 g/m² |
| 4 oz/ft² | 1220.606909 g/m² |
| 5 oz/ft² | 1525.758636 g/m² |
Where it's used
Ounces per Square Foot are used for coated fabrics and laminates, while grams per square metre appear in woven, knitted and nonwoven fabric specifications (ISO 3801, ASTM D3776). Both measure fabric weight (mass per unit area, GSM), so the conversion is a fixed factor.
Ounce per Square Foot to other fabric weight units
| Conversion | 1 oz/ft² equals |
|---|---|
| ounce per square foot to gram per square metre | 305.1517273 g/m² |
| ounce per square foot to ounce per square yard | 9 oz/yd² |
| ounce per square foot to gram per square centimetre | 0.03051517273 g/cm² |
| ounce per square foot to pound per square yard | 0.5625 lb/yd² |
Frequently asked questions
How many grams per square metre are in 1 ounce per square foot?
1 oz/ft² = 305.1517273 g/m².
How do I convert ounces per square foot to grams per square metre?
Multiply the value in oz/ft² by 305.1517273. For example, 15 oz/ft² × 305.1517273 = 4577.275909 g/m².
Is the oz/ft² to g/m² conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "ounce (avoirdupois)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Ounces per Square Foot to Grams per Square Metre. Retrieved October 25, 2026, from https://scientificconverters.com/fabric-weight/ounces-per-square-foot-to-grams-per-square-meter/
IEEE
Scientific Converters, "Convert Ounces per Square Foot to Grams per Square Metre," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fabric-weight/ounces-per-square-foot-to-grams-per-square-meter/